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Analysis of dynamic computed tomography sequence of expiratory ventilation assistance group and control group. (a) Histogram of computed tomography values in steps of 50 HU. (b) Percentages of defined HU ranges: −1000 to −900 HU: airways and overinflated lung tissue; −900 to −500 HU: normally aerated lung tissue; −500 to −100 HU: poorly aerated lung tissue; −100 to 0 HU: nonaerated lung tissue. Box and whisker plots indicate median, interquartile range and full range.
